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In an earlier study (Mann et al., 1996), which employed a power density of 0.5 W/m², the authors found a hypnotic and REM-suppressive effect in subjects exposed to RF radiation from a GSM 900 MHz phone, pulsed at 217 Hz. In this study of twenty- four healthy subjects, the power density was 0.5 W/m². Otherwise the design of the study was the same as the first. The subjects were exposed to RF radiation from a GSM 900 MHz phone, pulsed at 217 Hz. The radiation was from a phone at the head of the bed, 40 cms. from the top of the head. An EEG was recorded during sleep. Each subject spent 2 sessions of 3 consecutive nights in the sleep laboratory. The sessions were separated by an interval of at least 7 days. The first night was an adaptation night, and on the second and third nights the subjects were either exposed to the RF radiation or were sham-exposed, with the order being reversed at the second session. No significant changes were found in sleep or EEG patterns.
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